linux-kernel - Re: [PATCH 2/2] block: avoid to drop & re-add partitions if partitions aren't changed

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Message-ID: <20210205071429.GA28033@lst.de>
Date:   Fri, 5 Feb 2021 08:14:29 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Ewan D . Milne" <emilne@...hat.com>
Subject: Re: [PATCH 2/2] block: avoid to drop & re-add partitions if
 partitions aren't changed

On Fri, Feb 05, 2021 at 10:17:08AM +0800, Ming Lei wrote:
> block ioctl(BLKRRPART) always drops current partitions and adds
> partitions again, even though there isn't any change in partitions table.
> 
> ioctl(BLKRRPART) may be called by systemd-udevd and some disk utilities
> frequently.

Err, why?  We should probably fix udev to not do stupid things first.